Myocarditis is a rare but real Covid vaccine side effect. A new study sheds light on what might cause it
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While extensive studies have found Covid-19 vaccines to be safe, effective, and to have saved millions of lives<\/a> during the pandemic, these shots come with a rare but real<\/a> risk of inflamed heart muscle, or myocarditis. Scientists on Wednesday reported that they have identified a pair of immune signals they believe drive these cases \u2014 and offered early evidence that these signals can be blocked.<\/p>\n Researchers sifted through previous Covid vaccine studies and identified a pair of immune signaling molecules, or cytokines, present at higher levels in the blood of vaccine recipients with myocarditis: CXCL10 and interferon-gamma (IFN-\u03b3). The authors found that these signals could also be triggered in the lab when immune cells were exposed to the Pfizer and Moderna Covid vaccines, or when mice were inoculated.<\/p>\n